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How to control DC 30 amps and pneumatic central lock valve

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tlhsglm:
Hi fellows,
1- I have to control(just on/off) a mini compressor, 12v 21 amperes.What is the fastest way to do this?
2- I will use a valve that drives 2 cylinders.That valve has a specialy, it have central locking, when i lift the load with cylinders, i will lock the valve to prevent load go down.This is important, i dont want compressor to work always.when i want the load to go down, i will simply make valve to stop locking.Is anybody work with this valves?How can i do that?Valve is 12v 4W.

Kalin:
Some more information will be needed about the valve and what exactly you are looking for to control it, but for 12V 30A I would either use a Solid State Relay or a contactor. What are you using for process control, ie: do you have a PLC or are you planning to use an arduino or is this entirely discrete controls(pushbuttons and limit switches)?

i_am_fubar:
30A 12v is well within MOSFET territory if you want solid state. But SS relay is also option

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